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2 Way to run an External WG: Does it matter which one you do?

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oreopride18

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Discussion starter · #1 ·
Alright; my car has a nice base tuning and everything is great on the new setup. But this one thing (that I asked on here a month or so back) still urks me:

the proper way to route the vacuum lines to the EWG. This isn't so much a problem as it is a I-want-the-best-results-for-my-car. On a tial 38mm Half the people I route a Tee'd in line from the MBC to the side port of the WG. They then leave the top port VENTED. My car runs like this without any noticable problems.

But at the same time some people T in the line from the MBC to the side port. They then run a vacuum line from the top port of the EWG to the "E" port on the throttle body (or any other vacuum inducing ports on the TB)

Greddy says to do it the latter way. Tial says to opt for the former way.

I'm starting to think this is like venting a BOV on a stock MAF system and a lot of people are doing something that's hurting them; jut not conciserably or that's noticable to the pants feeling.

And as of now I've switched to the Side port to MBC and top port to the E on the throttle body way. It seems like the top would create an unnecsaryu leak (but my car ran fine like that for the past month)
 
#2 ·
I am running the same thing with the top of the wastegate left open and uncapped and the other to the wastegate so I have the same set up as you did and would like to know too if there is a better way of doing it or if its just not necessary. You think it would be there for something
 
#3 ·
well...I used to have a deltagate...right now I sold it but mine was the lower fitting to the intake manifold and from there a T with the MBC to the port on the top...If I put it like you has yours it wouldn't pass from 12psi...even with the boost line removed...I think the eshaust flow opened the valve...anyhow with the MBC on the top it was at 22psi with no creep or anything;)
 
#4 ·
I've see some cases that the external wastegate is like yours and has lots of lag with a 16g between shifts...maybe it's because the exhaust flow (like I sais above) once the pressure of the line opened the valve the exhaust flow help to keep it open and from there's the lag...it's just a case that I had with a friend's car
 
#5 ·
Yeah I've been wondering about this as well. How does the external wastegate actually work each way?

Also, at least with the Tial 40mm, if you use both, I think the top port goes to the boost source that the MBC used, and the side port goes to the intake manifold.
With using only one, the side port goes the the boost source and the top is vented.
 
#6 ·
I work in a performance shop and we hook all our external wastegates up the same way. With a tial or delta gate and a turbonetics manual boost controller. We run the side port to the in port on the boost controller and tee the turbo boost port in there and then we run the out port on the boost controller to the top port of the wastegate. The diffrence in pressure on each side of the digaphram is what controlles boost.
 
#7 ·
exactly...at least that's how every external should be mounted...en every instruction manual of the boost controllers i've seen...either manual or electronic that's how they say to conect it...this way the pressure on the top is holding the valve closed until a certain boost...
in the other way...let's say if your external has a 9psi spring...if you conect the wastegate to the intake manifold directly it should open at 9psi...if you put a MBC in this line you are just restricting the pressure that's going to open the valve so it opens at more boost...but there's a certain boost it will hold this way until the exhaust flow open the valve by itself;)
 
#8 ·
Doh sorry for putting confusion here. I was thinking of setting it up using an EBC:rolleyes:

Even with what I said, that doesn't make sense if you're using an EBC because I didn't mention the control solenoid. FORGET WHAT I SAID:eek:
 
#9 ·
Does it matter that I am venting into the atmosphere instead of into the exhaust system? I run a dump tube into the engine bay and it doesnt go back to exhaust system. AMS hooked it up and it hasnt been changed since so it must not be to bad the way it is.
 
Discussion starter · #10 ·
I work in a performance shop and we hook all our external wastegates up the same way. With a tial or delta gate and a turbonetics manual boost controller. We run the side port to the in port on the boost controller and tee the turbo boost port in there and then we run the out port on the boost controller to the top port of the wastegate. The diffrence in pressure on each side of the digaphram is what controlles boost.
Click to expand...
That makes just about perfect sense to me and I guess I'll give it a try tomorrow. One thing that is going to make me sound like a jackass:

What is the turbo boost port you refer to? Is that the one that runs between the BOV and intake manifold? The way I've always had my side port on the EWG was:

I had a line that runs from the intake manifold to the BOV. T-d in the middle of hte line is one port of the MBC. Then from there the bottom of the boost controller goes directly to the side port of the External Wastegate.
 
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